Rotary pump



March 22 1927. 1,621,495

C. M. CONRADSON RQTARY PUMP Filed March 6, 1926 4 Sheets-Sheet 1 r 4% WM 'wkws 1 E5. ,Wjzmewf .2

March 22 1927.

' 1,621,495 C. M. CONRADSON ROTARY PUMP Filed March 6, 192 4 Sheets-Sheet 2 l March 22, 1927.

C. M. CONRADSON ROTARY PUMP.

Filed March 6. 1926 4 Sheets-Sheet 5 March 22,1927. v 1,621,495

C.'M. CONRADSON ROTARY PUMP Filed March 6, l926 4 Sheets-Sheet 4 a 7 0 z w a 0 6 w 7 0 v J A 6 7 W fiw WM 7/7,, l. M M. a .&%@@@4% my W. rd

Patented Mar. 22, 1927.

'rect and effective means are UNITED sjr- 'rss I 1,621,495 PATENT? "OFFICE.

' 001mm at. common, of exam: BAY, WISCONSIN.

, ROTARY Application m March 6,

This invention relates to pumps of that class in which one or more cylinders is ar-' ranged in a rotating member, the cylinders being provided with pistons ,to whichavariable stroke is imparted by an "offset centrally disposed crank pin.

One ofthe objects of .the invention is to provide apump of the class named which shall be simple. in construction, powerfulv and efiicient in operation, and in which d1- provided for counteracting the stresses" inc dent to the operation of the pump.

Other objects and advantages Wlll appear hereinafter. i

The invention is exemplified in the combination and arrangement of parts shown 3 in the accompanying drawings and de- .scribed in the following specification, and it is more particularly pointed out in the appended claims. In the drawings I Fig. 1 is a longitudinal section through a pump, illustrating one form of the present invention f Fig. 2 is a transverse section'substantially, on line 22 of Fig. 1; Fig. 3 is a section on line 3-3 of Fig. 1, showing the eccentric for-the crankpin in one position of adjustment;

Fig. 4 is a section on line 33 of Fig. 1, showing the eccentric in a difierentposition of adjustment;

Fig. 5 is an end view looking from the ri ht in Fig. 1, with parts broken away';

ig. 6 is a section on line 6-6 of Fig. 1, looking in the direction of the arrows;

Fig. .7 isa section on line 6-6 of Fig. 1,

looking in the direction opposite the arrows Fig. 8 is a section on line 8'8 of Fig. 5;. Fig. 9 is a section on line 9'9 of Fig. 5; and 4 Fig. Fig. 5. I

The pump mechanism is enclosed in a hollow spherical casing 15 having a detachable end plate 16 held in place by cap screws 17 at one end of the casing and a smaller end plate 18 held in place by cap screws 19 for closng the opposite end of the isa section on line 10 -10 of easing. A cylinder-carrying member '20 is arranged within the casing and is'supported at one end on bearings 21 which rest upon a sleeve 22 projecting inwardly from a web 23 formed integral with the end plate 16. The cylinder-carrying member is run.

1926. Serial No. 92,749.

provided with a detachable portion 25 held to the portion 20 by cap screws 26. The part 25 is provided with a cylindrical bearlng portion 27 which is supported on the end plate 18 by a radial and thrust bearing 28..

able, driving pulley, not shown, is attached.

This shaft extends through a central 0 ening in the plate 18 and is surrounde by packing 32. It is apparent that rotation of the shaft 31 will rotate the cylinder-carrying member 20 within the housing 15.

A shaft134 has one end journaled in the sleeve 22 and has its opposite end supported in'bearings 35 supportedwithin the cylindrical bearing drum 27. A hearing 36 is interposed between the shaft 34 and the part 25 so that the stress between the shaft 34 and the cylinder-carrying member 20 is sup ported on "the two bearings 21 and 36.- The shaft 31 is provided with "an eccentric portion 37 which fits a cylindrical opening in a slide block '38 arranged to slide in guide faces? 39 in the crank pin 40. The crank pin 40 has a cylindrical-outer surface and is free tomove vertically, but is held against transverse movement by. a plate '41 having ribs 42 which intermesh with ribs 43 on the end of the crank pin 40. The plate 41 is held from rotation by projections 44 which extend into slots formed in .the end of'the" sleeve 27.

Rotation of'the' shaft '34 will shift, the axis of the crank iiii'40i'ei ti'cally, the crank pin being shown in central position in Figs. 1

and 2, and in extreme positions-'infl igs. 3 v

and 4. Theshaft'34 is' fotate'd by'a'worm 45 meshing witha worm wheel 46 secured to the end of the shaft. Varlous forms of control mechanism may be employed for rotating the shaft 45. Connectingrods 43' are provided with'bearing faces 48 which rest upon the outer surface of the crank pin 40. The connecting rods 47 support pistons 49- in the cylinders .50 formed in the '52. When the cylinder support 20 is rotated the connect'ng rods47 will rotate upon the outer surface of the crank pin 40 and when the crank pinis eccentrically disposed the;

- there will'be no'reciprocation of the pistons and the reciprocation will be maximum when the crank pin is in either of the posit-ions shown in l'igs. 3 and 4a The amount of reciprocation may be var-"ed through all values between these two extremes to regu I .late the quantity of-material umped by the apparatus. The direction o delivery will be reversed bychanging the a'xisof the eccentric portion of the shaft 34 from oneside to the other of the axis ofthe shaft- Each of the cylinders is provided with aort 53'communicating with the-other end 0 the cylinder. The ports 53 open through the end face of the cylinder-carrying member 20 in spaced position, as shownin Fig. 6.

In the embodiment shown in the drawings. there are seven cylinders and correspondingly seven ports leading from these cylin-- ders. The web 23isprovided with'a valve face 54 disposed against the end face of the cylinder bearing member 20 through which the ports 53' open.

Ateach side of, the end member 16there is provided a nozzle 55 connecting with elongated ports 56 which open through the valve face 54, as-shown in Fig. '7; It will be apparent that the upwardly moving cylinders at one side of the pump will 'be connected through the ports 53 and 56 with one of the be regulated "by nozzles 55 while the down moving cylinders at the opposite side of the pump will be con-' heatedthrough the ports at the other side of the um with theo osite nozzle 55. When P E P the cran ing in liquid through the connecting nozzle whilethepistons. at the opposite side will be dischargingliquid through the other noz-' ivery, of the pump will be reversed. The

amount of delivery in. either direction may -tioned that they produce a somewhat,-

pin 40 i-s.o set upwardly-the pis tons at one side of the pump will be draw- "i he; nozzles 55.

adjusting the eccentricit of the crank pm by rotating thev shaft 3 valve faces .and thereby insure close contact between the-VaIVeflfaces. To insure suction in startinglthe pump each piston is provided With-a spring 59, the pressure of which is added" tmthe pressure. of the fluid against the piston, It will be seen that the pistons beanjagainst the flange 30 so that the thrust is transmitted through the bearing 28 to the outer casing of the pump.

U-leathers 60 are used for packing the pistom 49 in the. cylinders 50 and these U- leathe'rs are held in place by caps 61 thread- I edi into the openings in the ends of the cylinders 50 and having skeleton flanges engaging the U-leathers. The outer case 15 is provided with an opening 62 at its top in registration with'which the caps 61 may be with oil. and a plenum tank 63 may be atmoved. This makes'it possible to replace the U-leathers Without disassembling thepump The interior 'of the case 15 is filled tached to: the case 15 to register with the opening 62, the tank being provided with a head .of oil 64 to insure a supplyfor filling the case at all times. The pump is'designed to operate in connection. with a c1osedsystern in which the liquid used is the same as.

that contained in the casing 15. In a system of this kind relief valves maybe emgloyed for excess pressure and arranged to ischarg'e directly into the casing of the iec ted to atmospheric pressure the liquid evel in the tank will readily rise'to accommodate any oil discharged through the res ump. Since the plenum tank 63 is sublief valve into the pump casing. These valves a're formed on the outer face .of the end member 16, as shown at 65, and have discharge openings 66, as shown in Fig. 8', communicating directly through the end member 16 with the interior of the pump housing. The valves are contained in sleeves 67 formed integral with the wall 16 and having a recess 68 extending around the interior of each sleeve. The recesses 68 communicate through cored openings 69 with Hollow cylinders 70 are secured within the sleeves 67 by caps 71 and the Valve openings 66 are closed by valves 72 carried'by valve stems 73 which are operatedby springs 74 disposed within the cylinders 70 and bearing against nuts 75 secured to the end of the valve stems 73. When the ressurewithin the nozzle 55 becomes su ciently great to overcome the force of the spring 74 the valve 72 will open and discharge suflicient liquid into the pump housing to relieve the excess pressure.

' Replenishing valves 76 are also formed on the end plate 16 and are connected with the nozzles 55 through cored openings 77 i in 'a manner similar to the relief valves 65. The replenishing valves, asshown in F ig. 9, are closed by balls78 which are held sea-ted by springs 7 9 and which open fromthe interior of the casing to the nozzles to replenish any deficienc in the liquid in the system, from the liquid containedin the pump hous-g ing. The liquid in the plenum tank 63 "will supply the hquid'thus withdrawn from the pump housing; a a

I claim I I 1. A pump comprising .a rotary cylindercarrying member, a crank pin about'which said cylinder-carrying member rotates pis tons connected with said crank pin, a rotary. shaft for supporting said crank-pin, and means for shifting the axis of said'c'ra-nk pin when said shaft is rotated. i

2. A pump comprising a rotary member having radially disposed cylinders therein,

pistons arranged to reciprocate in said cylinders, a crank pin about which said cylinders rotate, connecting rodsinterposed be tween said cylinders and crank pin,-'a shaft having an eccentric portion engaging said crank pin, and means for rotating said shaft to shift the-axis of said crank pin to regulate the stroke of said cylinders.

3. A. pump comprising a rotary member having radially disposed cylinders therein, pistons in said cylinders, a crank pin about. which said cylinders-rotate, connecting-rods interposed between said crank pin and cylinders, a shaft having an eccentric portion on which said crank pin is mounted, means forrotating'said shaft to shift/the axis of said crank pin, and means for guiding said crank pin for straight line movement transverse to theaxis thereof.

4;. A pump comprising a rotary cylindercarrying member, a shaft having an eccentrio portion about which said member rotates, a slide block mounted on said eccentric portion, and a crank pin having an elongated opening therein for receiving said block, saidiblock being slidable in said elongated opening transverse to the axis .of said shaft. 5; A pump. comprising a rotary memberhaving radial cylinders therein, pistons in said cylinders,a crank pin for said pistons about which said cylinders rotate.- and means for shifting the positionof said crank pin relative to the axis of rotationof said cylinders, said shifting means comprising a block mounted for sliding movement transverse to the axis of rotation of said cylinders in an elongated 'openingin said crank pin, an cecentric for moving said, slide block, and means for constraining said crank pin to move in a direction transverse to the direction of movement of said slide block in said elongated opening.

(5. A pump comprising a rotary member having radially disposed cylinders therein, pistons slidably mounted in said cylinders. acylindrical crank pin about. which said cylinders rotate, connecting rods interposed between said crank pin and pistons, a shaft tier-carrying member.

extending through said crank pin and' liiiii vto said crank pin transverse to said firstnamed direction, and gu des for constra1n-' 'ing' said-crank pin, to move in sa1dfirstnamed direction'when said shaft is rotated to shift the position'of said eccentric portion.

7 A pump comprising a stationary casing, a cylinder-carrying member mounted to rotate within said casing, a crank pin about which said cylinder-carrying member rotates. a shaft having an eccentric port on for shifting the position of said crank pin, and guiding connection between said'cra'n'k pin and stationary casing for restricting said crank pin to straight-line movement transverse to the axis of rotation \of said cylin.-

8. A pump comprising a stationary casing, a cylinder-carrying member mounted for rotation-within said casing, a crank pin about' which said cylindercarrying member rotates, said crank pin having guiding connection at one end thereof with said stationary casing for constraining said crank pin from rotation while permitting straight line fin 9. A- ump comprising a stationary casing,

a cylin er-carrying member mounted for rotation Within said casing, a crank pin about which said cylinder-carrying member rotates, a shaft having an eccentric'portion for shifting said crank pin, and a guide plate intcrposedbetween one end of said crank pin and said'stationaryrasing, said guide plate having projections on opposite faces thereof for engaging said crank pin and casing. respecti\'ely-, to hold said crank pin against rotation while permitting straight line mm'ement thereof transverse to the axis of rotation of said cylinder-carrying member.

10. A pump comprising a stationary housing, a. cylinder-carryingmember mounted to rotate within said housing, a shaft-coaxial with said cylinder-carrying member having one end thereof projecting from said housing. acrank pin mounted on said shaft within said housing,'and means operated by said shaft to shift the axiszof said crank pin transverse to the axis of rotation of said cylinder-carrying member.

11. A pump comprising a stationary housing, a member having cylinders therein inders, connecting rods interposed between pistons in said cylinders,- connecting-rods interposed between said cank'pin and piss tons, means for holding said crank pin I centricand rotary member and actuated by @the movementiof said rotary member about said eccentric, and bearings interposed beagainst rotation while permitting movement thereof transverse to the axis of said shaft, and an eccentric -member on said, shaft for shifting said crank pin when Isai'd'shaft is, I

4 fcent theends of said eccentrlct-for counterrotated.

12. A pump comprising a'stationary housing, a member having radially; disposed cylinders therein rotatably mounted within said housing, a shaft co-a'xialwvith? said member and having one end thereof projecting from said housing, a crank pin mounted on said shaft, pistons disposed insaid cylsaid pistons and crank pin and having sliding -conne:tion with the outer face of said.

crank pin, said shaft having an eccentric portion IBgIStQi'IIIg'WIth said crank pm, a

block having an openin therein fitting said eccentric portion, sai block being disposed in atran'sversely elongated opening in said crank pin to permit sliding movement of said block relative to said crank pin-incne direction while restraining'said "block-against movement relative to said jcrank pin in the direction transverse to the Y of said eccentric.

direction of saidsliding movement, and a plate interposed between one end, of said crank pin and a fixed portion of said hous-' 'ing, 1 a cylir'ider-carryingv member mounted for rotationwithin said housing, a shaft ing, said plate having a projection thereon for restraining said crank pin against rotation while permitting movement thereof an eccentric about which said member rot'ates, pumping mechanism interposed between said rotary member and eccentric, and bearings for said rotary member closely adjacent the. ends of said ecrentric.

15. A pump comprising a rotary member, a shaft arranged co-axialwith said'member, an eccentric on said shaft, pumping mechanism interposed between said rotary member and eccentric andactuated'by rotation of said member about said eccentric, and bearings interposed between said rotary member and shaft closely adjacent the ends 161 pump comprising a stationary housing, a member journaled for rotation in said tween said rotary member and shaft adjaacting the force exerted between said rotary member and eccentric by said pumping mechanism, I i 1 17 A pump compris ng a stationary-housa ing, a cylinder-carrying member within said housing, a shaft arranged concentric with 'said cylinde1'carrying member, pumping mechanism interposed between said shaft and rotary member, a sleevev on said housing surrounding sald shaft, and a bearing interposed between said sleeve and said rotary member. 7

18. A pump comprising a stationary housing, a cylinder-carrying member mounted to rotate within said housing, a. shaft arranged co-axialv with said cylinder-carrying member, a sleeve fixed to said housing and surrounding said shaft, a bearing interposed between said sleeve and cylinder-carrying member, an eccentric mounted on said shaft,

and pumping mechanism interposed between said eceentricand cylinder-carrying member.

19. A pump comprising a stationary housios cylinder-carrying member for counteracting force exerted by said pumping mechanism on said shaft and cylinder-carrying member. 20. A pump comprising a stationary housing, a, cylinder-carrying member mounted for rotation within said housing, a shaft arranged within said housing co-axial with, said cylinder-carrying member, a "sleeve formed on. said housing in which said shaft is mounted at one end thereof, the opposite end of said shaft being journaled in said cylinder-carrying member, a crank pin mounted on said shaft within said housing; means for shifting the position of said crank pin transverse to the axis of said shaft when said shaft is rotated, pumping mechanism interposed between said crank pin and cylinder-carrying member, a bearing interposed between said cylinder-carrying member and sleeve at one end of said crank pin for transmitting force between said shaft and cylinder-carrying member through said sleeve, a

carrying member and shaft at the opposit e end of said crank pin, and a bear ng inter! posed between said cylinder-carrymg member and stationary housing adjacent the end of said crank pin journaled in said cylindercarryingvmember. 21, A pump comprising a stationary housing, a member having radially disposed cylinders therein mounted for rotation within said housing,'a bearingfor supporting said member within saidhousing adjacent one end of said housing, said member having a shaft projecting from said housing jat the ..end thereof adjacent, said bearing, a 'second shaft extending into said member and coaxial therewith, said second shaft projecting from said housing at the end thereof. op

site said first-named shaft, and pumping mechanism supported on said second shaft and co-operating; with. the cylinders in said member. r

22. A pump comprising astationary housing, a member having radially disposed cylinders therein mounted for rotation in said housing, a bearing for supporting said member in said housing adjacent one .end thereof, a drive shaft secured to said member and projecting from said housing at the end thereof adjacent said bearing, a control.

shaft co-axial with said member and projecting from said housing at the end thereof opposite said drive. shaft, pump operating mechanism mounted on said control shaft andco-opera'ting with the cylinders said member, bearings interposed between said control shaft and rotary member for resisting forces incident to'the' operation of said pumping mechanism, and means on sald control shaft for regulating said pumping mechanism when said control'sh'aftris rotated.

23. A pump com rising a stationary housing, a member having radially disposed cylinders therein rotatablymounted in said housing, a bearing interposed between said memberand housing adjacent one end of said housing,'a driveshaft secured to said member and projecting from said housing atlone end thereof, a control shaft having one end journaled in said member and having the other end extending from said housing at theen d thereof opposite said drive shaft, an eccentric on said control shaft, a crank pin mounted .on'said eccentric,'pis ton rods and pistons connecting said crank pin with said cylinders, bearings interposed between 'said'control shaft and rotary member adjacent the ends of said crank pin, and means .for rotating said control shaft .to

cause said eccentric to shift said crank pin transverse to the axis of rotation of said rotary member.

A pumpmmprising a member having radially disposed cylinders therein, a crank pin centrally disposed relative to said momber, means for shifting said crank pin into and out of concentric position relative to said member, means for relatively rotating said member and crank pin, pistons in said cylinders, connecting rods on which saidpistons are mounted, sald connecting rods having bearing surfaces engaging the outer face ofsaid crank pin, and rings havingflanges engaging said connecting rods to retain said connecting rods in position on said crank pin.

25. A pump comprising a member having a cylinder therein, a piston in said cylinder, a packing ring surrounding said piston, and a closure, for said cylinder removably secured to said cylinderand arranged to hold 'said'packing ring in place.-

.26. A pump comprising a member'having a cylinder therein, a piston in said cylinder,

a packing U-ring'surrounding said cylinder,

and a removable closure for one end of said cyl1nder,sa1d closure havmg means thereon for engaging the inner portion of said U- ring to. retain said U-ring in place in said cyllnder. I

27. Ajpump comprising a member having a cylinder therein, a piston within said cylinder, packing surrounding said piston, and a removable closure for one endof-said cylinder; said closurehaving 1 a 4 skeleton flange thereon for engaging saidjpackingto retain said packing in place 'in said cylinder.

28. A pump comprising a member having a cylinder therein, a piston in said cyl-.,

inder, said cylinder having a recess surrounding said piston, a packing U-rmg disposed 111 said recess about sa d cylinder, and

a' removable closure for one end of said cyl-' inder having a flange thereon for engaging the interior of said U-ring to hold said' -movable ,closure for one end of said cylinder to permit access to said packing, said housing having an opening therethrough arranged to register with said removable closure to permit access to said cylinder for re-packing the same.

30. A pump comprising a housing, a rotary member mountedwithin stationary said housing and having a radially disposed cylinder therein, a piston within said cylinder, packing surrounding said piston, and a removable closure for one' end of said cylinder arranged to engage said packing to hold said packing in place, said housing having an opening 'therethrough arranged to register with said removable closure to A port and actuated by fluid permit re-paching of said cylinder while said rotary memberis in place in said her having cylinders therein rotatably.

mounted within said housing, said rotary member and housing having engaging valve faces, ports connected with said cylinders and opening through said valve faces, and means connected with said cylinders to be actuated by pressure therefrom to exert pressure on said rotary member to hold said valve faces in close contact.

33. A pump comprising a h'ousing,,a member having cylinders therein arranged to rotate within said housing, co-operating valve faces on said member and housing, ports communicating with said cylinders and opening through said valve faces,- and fluid pressure actuated means operating between said rotary member and housing for holding said valve faces in close contact.

. 34. A pump comprising a housing, a member having a cylinder therein mounted for rotation in said housing, said rotary member and housing having engaging valve having ports connecting said cylinders with said valve faces, and pistons .mounted in said member in registration with each of said ports for holding-said-valve faces in close contact, each of said pistons being actuated by fluid pressure from the cylinder which communicates with the port with which said cylinder is in registration.

38. A pump comprising a ho'usin a memberv having circumferentially distributed cylinders therein mounted for rotation with-J in said housing, engaging valve faces on said housing and member, said member having ports connecting said cylinders with said valve faces, pistons mounted in said member in registration with each of said ports for holding said valve faces in close contact, each ofv said pistons, being actuated .by fluid pressure from the cylinder which faces, a port communicating with said cyl-' inder and opening'through the valve face of said rotary member, and means arranged in registration with the opening of said ressure from said c linder for'pressing said valve faces into cibse contact.

35. A pump comprising a housing, a member having a cylinder therein mounted to rotate within said housing, said housing and member having engaging valve faces, said member having a port therein communicatlng'wlt-h said cylinder and opening through 1 the valve face in said member, a piston movably mounted in said member, and an abutment for said piston held by said housing, said piston being actuated by fluid pressure from said'cylinder.

36. A pump comprising a housing,a member having a cylinder therein mounted for rotation within said housing, engaging valve faces on said housingand member, said member having a port connecting said cylinder and valve faces, 'means actuated by fluid pressure from said cylinder for holding said valve faces in contact, and a spring for augmenting said holding means. 3 37.- A pump comprising a'housing, a mem her having circumferentially distributed cylinders therein mounted for rotation within said housing, engaging valvefaces on said. housing and member, said member communicates with the port with which said piston is in registration, and springs for augmenting the fluid pressure on said pistons. p

39. A pump comprising a housing, a member mounted to rotate within said housing, said pump and memberv having engaging valve faces, means for exerting force on saidmember to hold said valve faces incontact, an abutment for said force exerting means, and a thrust bearing interposed between said abutment and housing.

40. A pump comprisin a stationary housing, a member mounted to rotate within said housing and havin said cylinders with said valve faces, pistons slidably mounted in said rotary mem-.

ber and connected with said cylinders to be actuated by fluid pressure from said cylinders, springs for augmenting fluid pressure on said pistons, an abutment member for said pistons, and a thrust bearing interpomd between said pistons and OHSIIIO". '41.

tem closed housing forsaid pump having space therein separate from said circulatory system, pumping mechanism disposed within said housing, and a plenum tank for maintaining a supply of oil Within said housing, said tankhaving free communication with the space in said housing separate from said circulatory system so that a head of oil in said tank will cause said spaceto befilled with oil.

42. A pump comprising'a closed housing, pumping mechanism dlsposed wlthin said housing, a plenum tank for maintaining a supply of oil within said housing, and means radially disposed cylinders. therein, engaging valve faces on I00 the pump comprising a circulatory sysfor establishing communication between vthe interior of said housing and the circulatory system of said pumping mechanism.

43. A pump comprising a closed housing,

rotary pumping niechanism disposed within said housing. and having a system of-passages through which liquid is circulated by said pumping mechanism, and a valve. for

cstabisliing communication between the in-"' 'terior of said housing and said circulation system.

44. A pump compr sing a closed housing,

rotary pumping mechanism disposed within said housing andliaving a system of passages through which liquid is circulated by said pumping nechanism, aiid a relief valve arranged to discharge into said housing.

I 45. A pump comprising a housing. pumpand having a system of passages through which liquid is circulated by said mecha-v nism, a relief valve connected with said-circulation system and arranged to discharge into said housing, and aplenum tank ,for-

ing and having a system of passages through which liquid circulated by said mechanism, areplenishingvalve arranged to open at a predetermined excess of pressure in said housing .over jthepressure in the portion of said system with which'said valve is connected, and apl'enum tank for maintaining a supply of liquid in said housing.

; 48. A pump comprising a closed housing, pumping mechanism disposed within said housing and having. a system of passages through which liquid is circulated by said mechanism, a valve having an openingcommunicating between sa d circulationsystem and the inter or of said housing. and a spring for closing said valve, said spring arranged toyield to a predetermiiied'excess of pressure to permit liquid to flow from the interior of said housing to said circu'ation" system. V

49. A pump comprisinga closed housing, pumping mechanism disposed within said housing and having a circulation system through which liquid 'is forced by said pumping mechanism. a pair of nozzles communicating with said circulation system, and relief and replenishing valves connected with said nozzles and communicating"with the interior of said housing. I

50. A pump comprising a'closed housing, pumping mechanism disposed within said housing and having a circulation system through which liquid is forced by said pumping mechanism, relief and replenishing mechanism disposed within said housing.

ing valvescommunicating between the iiitcrior of said housing and said circu ation system and arranged to open at predetermined excesses of pressure for permitting passage of liquid between the interior of said housing and said circulation system, anda plenum tank for niaintaining a supply of liquid Within said housin 51. A pump having two communicating iassa es therein ,JUm )lll mechanism for circulating fluid through said passages, and means for adjusting said pumping mechanism to reverse the direction of flow through said passages; I

52. A pump having two passages coinmunicating therewith, piston and cvlinder mechanism for circulating fluid through said passages, valves for alternately connecting said piston and Cylinder mechanism with said passages, and means for regulating the operation of said piston and cylinder mechanism to reverse the direction of flow of liq- .uid through said passages. 4

A pump having two passages coinmunicating therewith, a member having cylinders formed thereimpistons co-operating with said cylinders, valves for connecting said cylinders with said passages, and an adjusting device for regulating the operation of said pistons to reverse the direction 9 of flow of'fluid through said passages.

54L. A pump having two passages comr municating therewith, a rotary member having radially disposed cylinders formed therein, pistons arranged to reciprocate in said cylinders, a crank pin foroperating said cylinders when said member is rotated,

valve mechanism for connecting said cylinders with said passages, and means for shifting the axis ofsaid. crank pinto regulate the amount of flow through said passages and toreverse the direction of said flow.

55. A pump having a closedcasing and an exit passage, pumping mechanism within said casing for discharging liquid through said passage, and a relief valve communicating with-said passage and arranged to discharge'into said casing when excess pressure is present in said passage.

56. A pump having an intake passage communicating therewith, a replenishing valve communicating with said passage, and a supply reservoir connected with said valve, said valve being arranged to open to discharge liquid from said supply reservoir to said intake passage when the pressure in said supplyi'eservoir exceeds the pressure in said intake passage a predetermined amount) I 1 '57. A pump comprising a closed housing, pumping mechanism arranged within saidhousing, said housing having an intake passage communicatingwith said pump, and a valve interposed between'said intake passage and the interior of said housing, sai valve through said passage, a relief valve communicating with said passage, and a replenishingvalve communicating with said passage. V v

59. A pumphaving a pair of passages communicating therewith, pumping merhanism for circulating liquid" through said passages, means for reversing said pumping mechanism to reverse the direction of flow of liquid through said passages, and relief and replenishing valves connected with each of said passagesL I 60. A pump having a pair of passages connected therewith, pumping mechanism for circulating liquid through said passages, means for reversing said pumping meehanism to reverse the direction of fiow through said passages, and relief valves connected means for reversing said pumping mechanism to reverse the direction of flow through said passages, and replenishing valves conne:ted with each of said passages.

62..A pump comprising a closed housing I having passages therefrom, pumping mechanism arranged within said housing andocommunicating with saidpassages, means for reversing said pumping mechanism to re verse the direction of flow through saidpassages, relief and replenishing valves connecting each of said passages with the interiorof said housing, and a plenum'tank communicating with said housing for maintaining a supply of liquid therein.

In testimony whereof I have signed my name to this specification on-this 3rd day of March, A. D. 1926.

comm) MIcoNRAnsoN. 

